Still great after all these years-Dunlavy SC IVs

Ditto, ditto, ditto.

I have friends with Duntech Sovereigns. Keep your speakers, but you can probably greatly improve the crossover and soon you may need to replace the surrounds on the drivers.

You may try better IC or SCs, the bass repsonse of my SC-IV improved version has gone up a few notches after the cable upgrade.

Tbg: can you please elaborate on the improvement of the xo? Change the design of simply replace the caps?
Thanks!

Good design does not deteriorate. Foam surrounds and electrolytic caps may need replacement in time but quality design and construction will hold up.

I owned Duntech Princesses, the older sibling to the DAL SC-IV, for 19 years. My reason for selling them was to downsize to something physically smaller. I miss them.

I've said this several times before, having owned both, the IVAs are much better than the IVs in terms of driver integration.

Downsides: They are huge and heavy (and not particularly attractive)!